OSI/MHS Orientation Guide

Building Your Message Handling System

OSI/MHS Orientation Guide—424829-001

1-5

Compaq Messaging Products

There are several categories of X.400 and related messaging products you can use with

Compaq systems:

•

The OSI/MHS product family is the Compaq implementation of the 1988 X.400

Recommendations. It runs on Compaq NonStop systems and provides the services

of an MTA using the P1 protocol. It supports local and remote UAs using the P7

protocol and includes a standards-based programming interface for developing

gateway applications.

•

The NonStop Directory Services (NSDS) product family is the Compaq

implementation of 1988 X.500 Recommendations, and it includes the simplified

access control feature of 1993 X.500 Recommendations. X.500 defines a means to

distribute a database across multiple systems (or even multiple organizations). The

database can store a variety of information, including X.400 addresses. NSDS runs

on a Compaq NonStop system, and it can be used independently or in conjunction

with OSI/MHS.

•

Transfer is the Compaq messaging system. It includes both electronic mail

(PS Mail) and an interface for developing custom messaging applications. It also

Figure 1-2. User Agents and Message Transfer Agents

002CDT .CDD

Message Handling System (MHS)

Message Transfer System (MTS)

MTA

User

UserUser